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Posted to issues@hbase.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2012/05/05 03:23:49 UTC

[jira] [Updated] (HBASE-5945) Reduce buffer copies in IPC server response path

     [ https://issues.apache.org/jira/browse/HBASE-5945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HBASE-5945:
-------------------------------

    Attachment: buffer-copies.txt

Here's a first pass. I don't have great benchmark results, but it looked from my "jstat -gcutil" output like this cut the amount of allocation by a factor of 2.5x or so for a benchmark that returned large responses.

Can probably get rid of at least one more copy in there with a bit more trickery.
                
> Reduce buffer copies in IPC server response path
> ------------------------------------------------
>
>                 Key: HBASE-5945
>                 URL: https://issues.apache.org/jira/browse/HBASE-5945
>             Project: HBase
>          Issue Type: Improvement
>          Components: ipc
>    Affects Versions: 0.96.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>         Attachments: buffer-copies.txt
>
>
> The new PB code is sloppy with buffers and makes several needless copies. This increases GC time a lot. A few simple changes can cut this back down.

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